Swarup had earlier insisted that the government wasn't looking at cartelisation aspect at the moment.

There had been reports that some bidders could have indulged in cartelisation to keep the prices low for the concerned mines.

"In the schedule II, we were looking at four mines and in schedule III we are looking at five mines...Prima facie we found that it requires a re-examination, so it has been re-examined that is about all," Swarup had earlier said.

The bids of four coal blocks of the schedule II mines (producing) which were being re-examined were Gare Palma IV 2, Gare Palma IV 3, Gare Palma IV-1 and Marki Mangli III.

BS Ispat had bagged Marki Mangli III mine.

The coal blocks which did not figure in the list of successful bidders of schedule III mines(ready to produce) were Brinda and Sasai mine (one bid was invited for both the mines), Meral mine, Dumri mine, Tara mine and Mandla South mine.

While insisting that the government "has not looked at any such thing as cartelisation or anything of such sort", the secretary had said: "I have used the word 'outliers'. There is a pattern and if somebody falls outside that pattern that needs a examination.

"Whether it is a cartelisation or not it not something which I can say as of now. We are certainly not examining these aspects. We are examining if there is an outlier the reason for it and then we will take a call", he had said.

So far, a total of 33 coal blocks have been auctioned in two tranches. While in the first lot 19 coal mines were auctioned, in the second lot 14 coal blocks went under the hammer.